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- W1976705965 abstract "We describe a homogeneous competitive model immunoassay for determination of thyroxine by multi-frequency phase-modulation fluorescence. Using a non-radiative energy transfer transduction mechanism, B-phycoerythrin conjugated to thyroxine is the energy donor and a carboxymethylindocyanine dye conjugated to anti-thyroxine antibody is the energy acceptor. Energy transfer from B-phycoerythrin to the acceptor results in a decreased lifetime and/or phase angle. The fluorescence lifetime change reflects the extent of energy transfer. In the competitive immunoassay format, the donor-thyroxine conjugate and an analytical sample of thyroxine compete for acceptor-antibody binding sites, resulting in a phase angle change which is dependent on the amount of thyroxine in the sample. Dose response curves of phase angle versus thyroxine concentration demonstrate a broader dynamic range than comparable steady state intensity curves. Since phase-modulation lifetime measurements are largely independent of total signal intensity, sources of optical interference are minimized. The potential for whole blood measurements exists since the energy transfer lifetime method can be extended to longer wavelengths." @default.
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- W1976705965 date "1993-05-18" @default.
- W1976705965 modified "2023-10-18" @default.
- W1976705965 title "<title>Homogeneous model immunoassay of thyroxine by phase-modulation fluorescense spectroscopy</title>" @default.
- W1976705965 doi "https://doi.org/10.1117/12.144697" @default.
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